Novak Djokovic said he supported a domestic violence policy for tennis following allegations made against Alexander Zverev after the top seed reached the last four at the ATP Finals on Friday.

The Serbian beat his German opponent 6-3, 7-6 (7/4) on Friday. Zverev, who won the 2018 ATP Finals in London, has been competing under the shadow of serious abuse claims made by his ex-girlfriend Olga Sharypova. He strongly denies the allegations, which were made by the former junior player on Instagram and in two media interviews, but has not addressed them in any detail.